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Cushion|Lab Grown|IGI

1.59ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG520211712

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG520211712

Diamond specifications and retailer prices

From $387 NZD
$218 USD
As of November 1, 2026
Save $1,742 NZD (82%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $2,129 NZD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.59ct lab-grown cushion diamond

This 1.59ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG520211712 or 520211712. Listed at 13 retailers as of October 31, 2026, with prices from $387 to $2,129, a $1,742 spread on the same certified stone. Brilliant Earth lists it at $2,129. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.59
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38°
Pavilion angle31.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520211712
Dimensions6.53 × 6.34 × 4.23 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.53 mm6.34 mm1.59 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520211712
Side View
Table 60.5%Crown 38°Girdle: STK-VTKPavilion 31.3°Culet: NoneDepth 66.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $2,129 NZD|Low: $387 NZD|High: $2,413 NZD|Avg: $1,140 NZD|-11.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 9$387 NZD
Retailer 6$582 NZD
Retailer 4$708 NZD
Retailer 3$788 NZD
Retailer 10$869 NZD
Retailer 8$1,026 NZD
Retailer 5$1,040 NZD
Retailer 7$1,774 NZD
Retailer 2$2,017 NZD
Brilliant Earth$2,129 NZD

43 data points across 10 retailers

13 retailers$387 NZD to $2,129 NZD

A
Cheapest Retailer
-
$387 NZD
$218 USD
Final sale: no returns
B+
Retailer 2
-
$582 NZD
$328 USD
View
A
Retailer 3
-
$708 NZD
€380 EUR
View
A
Retailer 4
-
$788 NZD
£350 GBP
View
A
Retailer 5
-
$869 NZD
$490 USD
View
A
Retailer 6
-
$949 NZD
$535 USD
View
B+
Retailer 7
-
$1,026 NZD
$578 USD
View
A
Retailer 8
-
$1,040 NZD
$586 USD
View
B
Retailer 9
-
$1,482 NZD
$835 USD
View
Retailer 10
-
$1,774 NZD
$1,000 USD
View
Price last confirmed 11 days ago
B
Retailer 11
-
$2,017 NZD
£895 GBP
View
B
Retailer 12
-
$2,095 NZD
$1,181 USD
View
Most Expensive
B
Brilliant Earth
10788323A · Oct 31
$2,129 NZD
$1,200 USD
View
12 more retailers have this diamond
Prices start from $387 NZDSave up to $1,742 NZD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.59ct Cushion
$387 NZD